RFR: 8299237: add ArraysSupport.newLength test to a test group

[Stuart Marks]

On Thu, 22 Dec 2022 19:37:12 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> This test isn't part of any test group, so it isn't being run regularly! I'm adding it to the jdk_util_other test group.

OK, I guess I'll need to withdraw this PR and open a new one against JDK 20.

-------------

PR: https://git.openjdk.org/jdk/pull/11769